The main purpose of fertilizer is to increase the likelihood of flowers breeding (known as hybridization) and for fruit trees to grow a piece of Perfect Fruit.

Some bags of fertilizer on the ground.

Usage

Fertilizer must be buried near a tree or flowers to increase the chances of perfect fruit or hybrid flowers. It will disappear once buried for more than a day.

It cannot be used to prevent or repair grass deterioration. However, the growth of flowers that are the result of the use of fertilizer may be considered an indirect usage.

To obtain the gold shovel, 50 bags of fertilizer must be purchased.

Obtaining

In order to purchase fertilizer, the town must have T&T Emporium, which is the final Nookling Store upgrade. To upgrade to T&T Emporium, a total of 100,000 Bells must be spent at T.I.Y., four Gracie Fashion Checks must be completed in the town (the player can do this with more than one character) and T.I.Y. must be open for at least 30 days.